Molekula
Ponceau S (C.I.27195)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Ponceau S (C.I.27195) is a bright red azo dye widely used as a reversible protein stain for membranes in Western blotting and in histological staining. It stains by binding to proteins rather than through a pH colour change, making it valuable for confirming protein transfer and loading on blotting membranes and for analytical applications. CAS 6226-79-5, molecular formula C22H12N4Na4O13S4, molar mass 760.57 g/mol. Store at ambient temperature. Signal word: Warning. Molekula supplies Ponceau S from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £57.00 per pack ex VAT · £68.40 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Dark Red or brown powder |
| Solubility in water | Soluble in water |
| Dye content (by spectrophotometry) | ≥ 75.0 % |
| Loss on drying (110 °C) | ≤ 10.0 % |
| Absorption maximum in water | 517 - 523 nm |
| Specific absorptivity 1%/1cm (at λmax) | > 460 |
| Suitability for electrophoresis | Passes test |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 43797916 |
| CAS Number | 6226-79-5 |
| IUPAC Name | tetrasodium;3-hydroxy-4-[[2-sulfonato-4-[(4-sulfonatophenyl)diazenyl]phenyl]diazenyl]naphthalene-2,7-disulfonate |
| Molecular Formula | C22H12N4Na4O13S4 |
| Molecular Weight | 760.57 |
| Exact Mass | 759.8874 |
| SMILES | C1=CC(=CC=C1N=NC2=CC(=C(C=C2)N=NC3=C4C=CC(=CC4=CC(=C3O)S(=O)(=O)[O-])S(=O)(=O)[O-])S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+].[Na+].[Na+] |
| InChIKey | KQHKSGRIBYJYFX-UHFFFAOYSA-J |
| InChI | InChI=1S/C22H16N4O13S4.4Na/c27-22-20(43(37,38)39)10-12-9-16(41(31,32)33)6-7-17(12)21(22)26-25-18-8-3-14(11-19(18)42(34,35)36)24-23-13-1-4-15(5-2-13)40(28,29)30;;;;/h1-11,27H,(H,28,29,30)(H,31,32,33)(H,34,35,36)(H,37,38,39);;;;/q;4*+1/p-4 |
| PubChem CID | 2723873 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 32129000 |
| Tariff Code | 3212900000 |
Safety & GHS
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Hungarian, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Acid Red 112
- C.I. 27195
- C.I. Acid Red 112
- C.I. Acid Red 112, tetrasodium salt
- P 7170
- Ponceau Red S
- Ponceau S
- Ponceau S Extra
- Ponceau S sodium salt
- Ponceau S, BS
Frequently asked questions
What is Ponceau S (C.I. 27195) commonly used for?
Ponceau S is used mainly as a laboratory stain: a rapid, reversible protein stain for nitrocellulose and PVDF membranes in Western blotting, and a histological stain.
What is the chemical formula and molecular weight of Ponceau S?
The chemical formula is C₂₂H₁₂N₄Na₄O₁₃S₄, and the molecular weight is 760.57 g/mol.
How should Ponceau S be stored?
Store Ponceau S at ambient temperature in a cool, dry place, away from direct sunlight and incompatible substances.
What grade or purity is available for Ponceau S from Molekula?
Molekula supplies analytical grade Ponceau S, depending on requirements.
Can Molekula supply Ponceau S in bulk quantities?
Yes, Molekula can provide Ponceau S in bulk quantities, with packaging options tailored to your needs—contact us for specific volumes.
What documentation is provided with an order of Ponceau S?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.